Re: Astro CCDs still dragging their pixel feet

On Thu, 14 Apr 2005 23:22:12 +0100, Steve <steve@xxxxxxxxxxxxxxxxxxxxxx>
wrote:

>The last time I looked, the best CMOS imagers are about 5 times noisier
>than the best CCD. Don't know about sensitivity though - the area of
>pixel available for sensing is smaller on CMOS imagers than CCD ones.

The Canon CMOS sensors are less noisy than CCD detectors- at room
temperature. So these cameras can be reasonably used for exposures up to
several minutes. So far, however, a cooled CCD camera is the lowest
noise solution available.

Cooling a camera is expensive. It requires care in the mechanical design
to avoid stressing the fragile cooler while getting good thermal
coupling between the detector and cold side, and the heat dissipator and
hot side. It also requires a well sealed, dry chamber for the detector
to prevent dew and frost.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.

Relevant Pages

  • Re: Astro CCDs still dragging their pixel feet
    ... >>pixel available for sensing is smaller on CMOS imagers than CCD ones. ... So far, however, a cooled CCD camera is the lowest ... Virtually all the noise was eliminated. ...
    (sci.astro.amateur)
  • Re: Astro CCDs still dragging their pixel feet
    ... that it will be 12 before the year is out and there is every indication that their use in amateur astronomy will continue to grow. ... Don't know about sensitivity though - the area of pixel available for sensing is smaller on CMOS imagers than CCD ones. ...
    (sci.astro.amateur)
  • Re: true magnification of Televue 3x?
    ... This camera's CCD is the ICX424 which covers a larger ... > the filter wheel and Lum camera were added, the total length came to the ... > 50mm greater distance between the camera and modified barlow, ... saying, is that you found the image scale was smaller, because of the ...
    (sci.astro.amateur)
  • Re: true magnification of Televue 3x?
    ... I never had vignetting problems and since the Toucam was ... no filter wheel to add to the length of the optical train. ... This camera's CCD is the ICX424 which covers a larger area ... the filter wheel and Lum camera were added, the total length came to the ...
    (sci.astro.amateur)
  • Re: Brain teaser: Would 300 Hz TV solve the European - US compatibility problem?
    ... how to display a 50Hz camera on a 60 Hz monitor, ... A fairly typical CCD pixel is a 2 micrometer square. ... I would say 75% of that for white walls (13 photons on average per frame), ...
    (sci.electronics.design)